高精度組立のための溶接変形シミュレーション : (第二報) 板継溶接時の面内変形に及ぼす初期不整の影響

概要

論文の詳細を見る
In the 1st report, it was concluded that the shrinkage of butt welded plates is affected mainly by residual stresses induced at the previous stages of welding. Therefore, in the present 2nd report, the deformation of each skin plate after parallel gas cutting is statistically surveyed in the shipyard. And also practical methods to correct joint imperfection such as gaps or overlaps between adjacent plates in the preparing stage of welding are reviewed. A series of calculations in accordance with the practice of skilled workes is carried out based on the thermo-elasto-plastic analysis by the finite element method. The results are summarized as follows. (1) Skin plate after gas cutting deforms generally as fan-shaped or s-shaped, resulting that the correctin works such as tack welding or local gas heating are done to keep joint gaps minimum. (2) Above corrections give a bad effect to the plate deformation after one side automatic welding (FCB) , causing the plate shrinkage to be greater and irreguler.